Plone 5.1b4 zeopack error

Hi, I recently updated one of my Plone instances to 5.1b4 and now received the following error:

plone.recipe.zeoserver.pack ERROR Could not connect to zeoserver. Please make sure it is running.
trollius ERROR Exception in callback done_connecting(<Task ca....py:562>>) at /opt/plone/default/5.1b4/buildout-cache/eggs/ZEO-5.1.0-py2.7.egg/ZEO/asyncio/client.py:127
handle: <Handle done_connecting(<Task ca....py:562>>) at /opt/plone/default/5.1b4/buildout-cache/eggs/ZEO-5.1.0-py2.7.egg/ZEO/asyncio/client.py:127>
Traceback (most recent call last):
  File "/opt/plone/default/5.1b4/buildout-cache/eggs/trollius-2.1-py2.7.egg/trollius/events.py", line 136, in _run
    self._callback(*self._args)
  File "/opt/plone/default/5.1b4/buildout-cache/eggs/ZEO-5.1.0-py2.7.egg/ZEO/asyncio/client.py", line 129, in done_connecting
    if future.exception() is not None:
  File "/opt/plone/default/5.1b4/buildout-cache/eggs/trollius-2.1-py2.7.egg/trollius/futures.py", line 299, in exception
    raise CancelledError
CancelledError

I saw that with Plone 5.1b4 the ZODB packages have been updated and now ZEO 5.1.0 is used which depends on trollio as a Python 2.7 backport of asyncio. The zeo server is running, but the script fails to connect.

Any ideas on what to change for the pack script/zeo config?

Today we got another error:

plone.recipe.zeoserver.pack ERROR Could not connect to zeoserver. Please make sure it is running.
concurrent.futures ERROR exception calling callback for <Future at 0x7f9f3064f890 state=finished returned list>
Traceback (most recent call last):
  File "/opt/plone/default/5.1b4/buildout-cache/eggs/futures-3.1.1-py2.7.egg/concurrent/futures/_base.py", line 301, in _invoke_callbacks
    callback(self)
  File "/opt/plone/default/5.1b4/buildout-cache/eggs/trollius-2.1-py2.7.egg/trollius/futures.py", line 449, in <lambda>
    new_future._copy_state, future))
  File "/opt/plone/default/5.1b4/buildout-cache/eggs/trollius-2.1-py2.7.egg/trollius/base_events.py", line 496, in call_soon_threadsafe
    handle = self._call_soon(callback, args)
  File "/opt/plone/default/5.1b4/buildout-cache/eggs/trollius-2.1-py2.7.egg/trollius/base_events.py", line 470, in _call_soon
    self._check_closed()
  File "/opt/plone/default/5.1b4/buildout-cache/eggs/trollius-2.1-py2.7.egg/trollius/base_events.py", line 297, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed

Maybe file a ticket at https://github.com/zopefoundation/ZEO/issues

Ticket created: https://github.com/zopefoundation/ZEO/issues/99